1. Francis Hall 328, Department of Construction Science, College of Architecture, Texas A&M University, 3137 TAMU, College Station, TX 77843-3137
2. Francis Hall 305, Department of Construction Science, College of Architecture, Texas A&M University, 3137 TAMU, College Station, TX 77843-3137
3. Department of Railroad Facility Engineering, Korea National University of Transportation, Uiwang-Si, Gyeonggi-Do 437-763, South Korea